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This speed gives Jupiter its strong magnetic fields and the dangerous radiation that surrounds it. It also gives it its strong weather patterns which mean it changes what it looks like very often.

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Right slap bang in the middle is a rocky core, which is slightly bigger than the earth, but weighs about 20 times more. It’s made of rock obviously but also metal, ice and hydrogen compounds. That must be pretty rock solid!

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So did you think there was just one moon? Well there’s not. Jupiter has actually got loads and loads of moons circling around it…in fact there are 63 moons (some say 64, so it’s not entirely clear)! The four largest and most well-known were discovered by Galileo as we said earlier and their names are Io, Europa, Ganymede and Callisto. Ganymede is the largest moon in the solar system and it measures 3,270 miles (5,268 kilometers) across, which is larger than the planet Mercury. This icy moon completes an orbit in approximately seven days. Another interesting moon is Io, which has fierce volcanoes and lava lakes. Mountains on Io can reach heights of 52,000 feet (16 kilometers).

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The magnetic field we’re talking about is 14 times as strong as the Earth, and has the strongest magnetic field in the Solar System. Some astronomers think that this magnetic field is made by the movement of metallic hydrogen which is found deep inside the planet.  The magnetic field kind of catches these ionized particles from the solar wind and speeds them up to almost the speed of light. That is incredibly fast. Because of this there is radiation around the planet. So if a spacecraft makes a turn around here, it would get seriously damaged.

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Are you ready for this amazing fact…the mass of Jupiter is 4,185,696,509,842,089,747,591,200,768 pounds (1,898,130,000,000,000,000 billion kilograms. That is one humungous number to try and even figure out.

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Jupiter orbits the Sun once every 11.8 Earth years. That’s a long time. Looking at it from Earth it looks like it’s moving really slowly, taking months to move from one constellation to another.

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Jupiter will never be able to become a star. Some scientists called it a failed star, but stars generate their energy through the fusion of mass together. Their gravity creates heat and pressure inside the star so that atoms of hydrogen are all pushed together to create helium which releases heat. In order for Jupiter to be a star it would need more than 70 times its current mass to ignite nuclear fusion. If you could crash dozens of Jupiter’s together, you could be in with a chance to make a new star.

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If you were to go down into Jupiter, the thin, cold atmosphere actually becomes thicker and hotter, which eventually turns into a thick, dark fog. In the blackness about 620 miles (1,000 kilometers) down the pressure squeezes the atmosphere so hard that it becomes like liquid which is like an ocean. What lies in between that ocean and the atmosphere? Well nothing actually. The atmosphere gets thicker and thicker until it literally becomes the ocean. How weird is that. But this is not like any ocean, as there’s no surface to it, you couldn’t actually go and have a quick boat drive around here. Basically the sky becomes the ocean.

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The red spot was first seen in 1665 by a man named Giovanni Cassini. A century ago it measured 24,854 miles (40,000 kilometers) across but it’s actually shrinking. At the moment it’s about half that size, but nobody knows if and when it will disappear for good.

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Jupiter actually has rings surprisingly. They are made from dust particles spewed out from some of Jupiter’s smaller worlds during impacts from comets and asteroids. The system starts at some 57,166 miles (92,000 kilometers) above Jupiter’s cloud tops and stretches out to more than 139,808 miles (225,000 kilometers) from the planet which would go around the earth nearly six times. What a huge system of rings! They are between 1,242 miles (2,000 kilometers) 7,767 miles (12,500 kilometers) thick. The rings of Jupiter are different to those of Saturn as there is nothing to suggest that there is ice in these rings which Saturn has. Scientists recently discovered a faint ring which resembles the shape of a doughnut and they called it Halo.

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Jupiter’s name came from the Roman god of mythology. He was the ultimate Roman God. So that kind of explains why the largest planet in the solar system is named after the most important god.  In Roman mythology, Jupiter was apparently the son of Saturn and the brother of Pluto and Neptune.

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You can see four of Jupiter's moons With a pair of binoculars at night. Also, Jupiter spins really fast; it only takes 10 hours to go from night to day on Jupiter. For this reason, its middle has been stretched out. Rather than round it is short and fat. Kind of like when someone spins pizza dough really fast to stretch it out. This planet shape is called an oblate spheroid.

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Jupiter is a very stormy planet. There are storms found throughout the atmosphere, and most of the storms seem to never end. The many different cloud formations and storms in the atmosphere also make Jupiter a very colorful planet.

Jupiter's great red spot, visible in the picture above to the right, is where a giant storm has been raging for at least 300 years. This red spot is also called "The Eye of Jupiter" because of its shape. This storm's super hurricane winds blow across an area larger than the Earth.

Jupiter is considered a gas giant because it does not have a solid surface. Under its atmosphere is a large liquid ocean of hydrogen and water. What lies in between that ocean and the atmosphere? Actually, there is no in between. The atmosphere slowly gets thicker and thicker until it becomes part of the ocean. In other words, Jupiter's ocean has no surface on which you could float a boat. The sky becomes the ocean.

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Moons:
Jupiter has 50 official moons and 12 provisional (unofficial) moons. The four largest and most well-known were discovered by Galileo in the year 1610. Their names are Io, Europa, Ganymede and Callisto. Some of the other moons are Adrastea, Ananke, Carme, Elara, Himalia, Leda, Lysithea, Metis, Pasiphae, Sinope, and Thebe.

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Surrounding the core is an ocean of liquid hydrogen, about 1,000 kilometres deep.

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t1Jupiter has many storms raging on the surface, most notably the big red spot which is the largest hurricane in our Solar System. It's been raging for over three hundred years.

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t1Jupiter has many storms raging on the surface, most notably the big red spot which is the largest hurricane in our Solar System. It's been raging for over three hundred years.

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RingsDid you know Jupiter has rings? They are faint and are only able to be viewed when Jupiter passes in front of the Sun. This is because the light from the Sun lights them up for us to see here on Earth. There are three rings in all. They are named Gossamer, Main and Halo

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RingsDid you know Jupiter has rings? They are faint and are only able to be viewed when Jupiter passes in front of the Sun. This is because the light from the Sun lights them up for us to see here on Earth. There are three rings in all. They are named Gossamer, Main and Halo

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t1The PlanetJupiter is by far the largest planet in our Solar System. The Earth could fit inside Jupiter more than 1000 times.

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t1The PlanetJupiter is by far the largest planet in our Solar System. The Earth could fit inside Jupiter more than 1000 times.

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Jupiter means: Jupiter, known as Zeus in Greek mythology, over threw his father Saturn to become king of the gods. He then split the universe with his brothers Neptune and Pluto.

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Jupiter means: Jupiter, known as Zeus in Greek mythology, over threw his father Saturn to become king of the gods. He then split the universe with his brothers Neptune and Pluto.